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Oct. l, 1946.
L. B. GREEN
2,408,629
MOLDING APPARATUS. AND~METHOD
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Filed oct. 21, Y1943
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Patented Oct. l, 1946
> 2,408,629
" UNITED sí--TA'TEs PATENT OFFICE ¿
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Momma ArrAaATUs AND METHOD
Lee B. Groen. Lakewood, omo
Application october 21, 1943, sox-iol No. 507.118
7 Claims.
’I'his invention relates to the molding of plastic
material and aims to provide -a novel method and
apparatus by which plastic articles can be rap
idly and economically produced and wherein such
articles will require
`
(ci. is-so) '
2
tèrnal screw thread II. The cap is here shown
as having a transverse end or top wall I2 and a
cylindrical annular skirt. |3, although articles of
other than cylinder shape can be produced by
my novel method and apparatus.
`
In Fig. 1 I show my novel molding apparatus
as including a mold - ly I5 having an opening
or bore I6 therein in which a pair of opposed
novel method and apparatus for> molding ar-,
ticles from plastic material in which a pair of
opposed plungers are slidable in a mold opening
for deñning the mold cavity and for shifting such
cavity with the molded materia1 therein. ~
A further object of my invention is to provide
a novel method and apparatus for moldingther
moplastic material in which the mold body has
heated and cooled sections and the movement
of the plungers is utilized to shift the mold cav
êty from the heated sections to the cooled’sec
ion.
`
'
"
plungers I1 and I8 are slidably operabley for de
ñning a mold cavity |9 in a portion of such open
ing or bore. My molding apparatus also includes
a device 20 for supplying plastic or thermoplastic
material 2| under pressure to the mold cavity I'9.
The mold body I5 may be Aof a sectional con
struction, as shown in the drawing, comprising a
guiding or supporting section 22, an intermediate
heated section 23 and an upper or outer cooled
section 24., These sections are suitably connected
together so that the opening or bore I6 extends
20 through the sections as a smooth and continuous
passage in which the plungers |'I and I8 slidably
operate. The heated intermediate section 23 is
partially isolated from the adjacent‘sections 22
article being molded from plastic material in a
die cavity can be subjected to an increased mold 25 and 24 by intervening air spaces, 25 and 26, for
retarding the transfer of heat from the section
ing pressure in the samefcavity and molding op
23 vto such adjacent. sections. The intermediate
eration for increasing the density of the article.
section 23 can be heated by any suitable means
Other objects and advantages of the invention
such as the heating coil 21 embodied therein and
will be apparent from the following description
when taken in conjunction with the accompany 30 to whichV a, suitable heating fluid or medium may
be supplied. The cooled section 24 is constructed
ing sheet of drawings in which:
.
with a passage or space 28 therein to which a
Fig. 1 is a partial longitudinal sectional view
suitable medium can be supplied for cooling this
taken through molding apparatus constructed ac
section of the mold body. 'I‘he heated section 23
cording to my invention and which can be used
Still another object of my ,invention is to pro
vide a novel method and apparatus by'which an
in carrying out my novel method.
Ä
.
is also provided with a passage 29 which commu
35 nicates with the mold cavity I9 and through which
¿ Fig. 2 is another partial longitudinal sectional
the plastic material can be supplied under pres
view of the same apparatus but with the mold
sure to the die cavity.
'
cavity in a different position.
The
device
20
for
supplying
the
moldable
ma
Fig. 3 is a. view similar to Fig. 2 but with the
mold cavity shifted to the cooled section of the 40 terial may be of a conventiona1 form comprising
a` body 3| having a cylinder 32 therein -adapted
mold body, and
to contain the material 2| and in which a plunger
Fig. 4 is another partial longitudinal sectional
33 slidably operates for subjecting such material
view of the apparatus with the slidable plungers
thereof moved to the article discharging posi- - to pressure. The inner end of the cylinder 32
is tapered to form a discharge passage 34 and
tion.
'
45
carries
a nozzle 35 which connects such passage
Before proceeding with the detailed descrip
with the supply passage 23 leading to> the die .
tion, I wish to point out that my invention can
cavity ||9. A‘heating coil 36 disposed around the
be embodied rin numerous different forms of
body 3| supplies heat to the Vcylinder and the
molding apparatus and is applicable to the pro
duction of a variety of molded articles. The in 50î material contained therein. Thermal insulating
material 31 .surrounds the heating coil 36 tore
vention is especially useful for producing articles
tard the loss of heat therefrom. As is usual in
molded from thermoplastic or thermosetting ma
devices of this kind, a spreader 38 is provided in
terials. In the embodiment of the invention
the
cylinder 32 for deilecting the plastic mate-v
shown in the accompanying drawing, the article
being‘molded is a hollow cap I 0 having an in-- 55 rial toward the side walls of the cylinder so that
it will be more readily heated by the coil 36. The
2,408,629
plunger 33 may be suitably actuated as by means
of a piston contained in the cylinder 39.
In Fig. 1 of the drawing I show the plungers
. I1 and I8 with their inner ends in adjacent re
lation so as to define the mold cavity I9 in a
portion of the bore I6 lying within the heated
zone or section 23 of the mold body.
The inner
end of the plunger I1 is of a shape correspond- v
4
projection 40 of the plunger I8, the article will
move with the latter plungerl away from the
plunger I1. The molded article can then be
manually removed from the plunger I8 by un
screwing the same from the threaded stem 40.
This operation can, if desired, be expedited by the
use of suitable mechanical means including a disk
or roller 42 having a soft rubber rim 43 which
frictionally engages the skirt of the molded article
ing with the shape of the end wall I2 of the
I0 and rapidly unscrews the same from the
article and the inner end of the plunger I8 car 10 threaded stem 40. Upon being unscrewed from
ries a threaded projection 40 which extends into
the stem 40 the article III is permitted to drop
-the mold cavity and serves as a core for forming
freely away from the plunger I8. Immediately
the internally threaded recess in the article I0.
after the removal of the molded article II), as just
The position of the plungers at this time is such
described, the plungers I1 and I8 return to the
15
that the mold cavity I9 will be in communication
position shown in Fig. 1 for the next molding
with the supply passage 29, preferably with the
latter leading into the mold cavity at a point
closely adjacent the inner end of the plunger I1.
operation.
Although I have described my method as in
cluding the intermediate step illustrated in Fig.
The molding operation as illustrated in Fig. 1 is
2 in which the article I0 is subjected to an in
at the point or stage where the thermoplastic 20 creased molding pressure, this step can be omitted
material 2I has been suppliedunder pressure to
if desired in which case the cooperating plungers
the cavity I9 so as to ñll the latter and form the
I1 and I9 shift the die cavity I9 from the posi
tion shown in Fig. 1 to the position shown in Fig.
molded article I0 therein.
In Fig. 2 I show the plungers I'I and I8 as hav
3. Likewise it will be understood that the move
ing been shifted in the bore I6 so as to disconnect 25 ment of the plungers I1 and I8 from one position
the cavity I9 from the supply passage 29. Dur
to another can be carried out either as a con
ing this movement of the plungers the inner end
tinuous or intermittent movement and at any
of the plunger I1 acts as a cut-off member which
severs the stream of thermoplastic material at
desired rate, depending upon the characteristics
of the material being molded, the size and shape
the point of its junction with the article I9 being 30 of the article being formed and the heating and
molded and thereafter seals the supply passage.
cooling requirementsof the mold cavity and the
Since the orifice 29a or point of connection of
material being molded.
the passage 29 with the cavity I9 lies in or is
The plungers I1 and I8 can be actuated by any
coincident with the inner wall or surface of the
suitable mechanism, for example, the plunger I1
bore I6, it will be seen that when the plunger I1 35 can be moved by a cam 45 of appropriate contour
severs the stream or stem of plastic material there
against which this plunger is held by gravity or
will be no flash or gate section adhering to the
spring pressure. The plunger I8 can be actuated
molded article IIJ nor will there be any mark or
by a -piston operable in a cylinder 4B and sub
irregularity left on the surface of the article.
jected either to fluid pressure or spring pressure,
Likewise there will be no gate section or similar -
piece of scrap material to be removed from the
supply passage 29 before the succeeding molding
or a combination of such pressures. The cam 45
can be driven by any suitable power means and
the operation of the cam and cylinder 4C can be
operation.
controlled by any appropriate mechanism to pro
The movement of the plungers I1 and I8.to dis
duce the above-described timed steps or sequence
connect the cavity I9 from the supply passage 29,
of operations of the plungers I1 and I8.
as just described, is a conjoint movement and
From the foregoing description and the accom
preferably shifts the die cavity I9 only a rela
panying drawing, it will now be readily under
tively short distance so that this cavity.. remains
stood that I have provided a novel method and
temporarily within the heated section 23 of the
apparatus for molding plastic or thermoplastic
50
mold body. Fig.,2 shows the mold cavity as hav
material by which various articles can be rapidly
ing been shifted to such a temporary position in
and economically produced and such articles will
the heated section 23 and at this point a relative
be of a superior quality and devoid of flash, gate
closing movement is applied to one or both of the
marks or other irregularities and will require no
plungers so as to subject the article I0 to an
increased molding pressure. This increased pres
sure squeezes the article so as to reduce the
porosity of the material being molded which re
55
trimming operation subsequent to the molding
thereof.
While I have illustrated and described my novel
molding apparatus and method in considerable
sults in a desired increase in the density and
detail it will be understood, of course, that I do
strength of the molded article in relation to the
not wish to be correspondingly limited but regard
60
thickness of its walls.
my invention as including all changes and modi
In Fig. 3 I show the plungers I1 and I8 as hav
fications coming within the spirit of the invention
ing been moved conjointly to a second interme
and the scope of the appended claims.
diate or temporary position by which the mold
Having thus described my invention, I claim:
cavity I9, with the article I0 therein, is shifted
1. The method of molding »articles `from ther
out of the heated section 23 and into the cooled 65
moplastic material or the like which comprises,
zone or section 24. At this point a cooling of the
forming a mold cavity between a pair of plungers
article takes place to further solidify and harden
slidable in a stationary mold body having a heated
the same.
section and a cooling section, supplying heated
Fig. 4 shows the plungers I1 and I8 as having
been moved to an article discharging station 4I 70 thermoplastic material to said cavity under pres
sure while the latter is in said heated section,
in which the plunger I1 preferably projects part
moving said plungers first conjointly in a sub
way out of the bore I6 and the plunger I8 has
stantially -ñxed spaced relation to each other to
been moved to a spaced position away from the
cut off the supply of said material to the cavity
plunger I1. Because of the interengagement
then relatively to each other to subject said
between the molded article I0 and the threaded 75 and
5
2,408,629
material to an increased molding pressure, and
then again moving said plungers conjointly in
a substantially ilxed spaced relation to each other
to shift said cavity with the molded article there
6
having a heated section and a cooled section so
as to bring the plungers to a spaced relation de
iining a mold cavity therebetween in the heated
section of the mold body, supplying said thermo
in to said cooling section,
l
'
plastic material to said mold cavity through an
2. The method of molding articles from ther
opening in the heated section of the mold body,
moplastic material or the like `which comprises,
then moving said plungers conjointly and in a
moving a pair of opposed vplungers in a mold body
substantially fixed spaced relation to each other
to a spaced relation deñning a mold cavity there
to cut off the supply of said material to the mold
between in the mold body, supplyingvsaid thermo 10 cavity,
next causing a relative closing movement
plastic material to said mold cavity through an
between the plungers for applying molding pres
opening of .said mold body, then moving said
sure to the material in said mold cavity, .and
plungers conjointly in a substantially fixed spaced
then again moving said plungers conjointly in
relation to each other. to cut off the supply of
the same direction as the first conjoint move
said material to the mold cavity, next causing a 15 ment to carry the molded 'article through said
relative closing movement between the plungers
cooling section to a point outside the mold body.
for applying molding pressure to the material in
6. 'I‘he method of molding articles from ther
said mold cavity, and then again moving- said
:noplastic material or the like which comprises,
plungers conjointlyin the same direction as the
moving a pair of opposed plungers in a mold body
first conjoint movement to carry the molded 20 having a heated section and a cooled sectiomso
article out of said mold body.l
,
as to bring the plungers to a spaced relation de
3. The method of molding articles from ther
ñning a mold vcavity therebetween in the heated
moplastic material or the likewhich comprises,
section of the mold body, supplying said thermo
moving a pair of opposed plungers in a mold body
plastic material to said mold cavity through yan
to a spaced relation defining a mold cavity there- 25 opening in the heated section of the mold body.
between in the" mold body, supplying said thermo.
then moving said plungers conjointly and in a
plastic material to said mold cavity through an
substantially fixed spaced relation to each other '
opening of said mold body, then moving said
to cut off the supply of said material to the mold
plungers conjointly in a substantially fixed spaced
cavity, next causing a relative closing movement
relation to each other to cut oil.' the supply of 30 between the plungers for applying molding pres
said material to the mold cavity, next causing a
sure to the material in said mold cavity, then
relative closing movement between the plungers »
again moving said plungers conjointly in the same
for applying molding pressure to the material in
direction as the iirst conjoint movement and in
said mold cavity, then again moving said plungers
a substantially i'lxed spaced relation to each other
conjointly to carry the molded article out of said 35 to carry the molded article through said cooling
mold body, and utilizing one of said plungers for
section to a point outside the mold body, and
maintaining said supply opening closed during
finally causing a relative separating movement
the movements of the plungers following the
between said plungers for releasingv the article
feeding of said plastic material into the mold cav
from between the plungers.
.
ity.
'
40
7. In molding apparatus the combination of, a
4. The method of molding articles from ther
stationary mold body having heated and cooled
moplastic material or the like which comprises,
sections and a bore therein extending through
moving a pair of opposed plungers in a mold body
said sections, said body having a supply passage
to a spaced-relation deilning a mold cavity there
therein for plastic material and opening into the
between in the «mold body, supplying said ther
bore at a point in said heated section, a pair of
moplastic material to said mold cavity through
opposed plungers movable in said bore lto a spaced
an opening of said mold body, then moving said
relation defining a mold cavity in said heated
plungers conjointly in a substantially ñxed spaced
section, means for discharging plastic material
relation to each other to cut oil' the supply of
into said mold cavity through `said opening, said
said material to the mold cavit , next causing a 50 plungers being movable simultaneously in the
relative closing movement between the plungers
for applying molding pressure to the material in
said mold cavity, then again moving said >plung
same direction and in a substantially ilxed spaced
relation to each other to cut off the mold cavity
from said supply opening and then relative to
eachother for subjecting said material to mold
ing pressure in said cavity, the plungers being
thereafter movable simultaneously in the same
article out of said mold bo'dy.'and ?nally causing
direction for carrying the molded article through
a relative separating’ movement between said
said cooling section and out of said mold body.
plungers for releasing the article from between
and
actuating devices for the respective plungers
the plungers.
'
»
60 and cooperating to produce such movements of
~5. The method of molding articles from ther
the plungers in sequential relation.
moplastic material or' the like which comprises,
moving a pair of` opposed plungers in a. mold body
LEE B. GREEN.
ers conjointly in theA same direction as the i‘lrst
conjoint movement and in a substantially ilxed
spaced relation to each other to carry the molded
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